Company interview vault

Razorpay Mid-level (3–5 years) System design

#4186

Design a URL shortening service — Razorpay interview

Reported in Razorpay interview loops. Foundational system design covering APIs, encoding, storage, and read-heavy scaling.

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Razorpay Mid-level (3–5 years) Coding / DSA

#4187

Explain and implement Dijkstra's algorithm for shortest paths — Razorpay interview

Reported in Razorpay interview loops. Graph algorithm for non-negative edge weights using priority queue.

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Razorpay Mid-level (3–5 years) Coding / DSA

#4188

Solve the 0/1 knapsack problem with dynamic programming — Razorpay interview

Reported in Razorpay interview loops. Classic DP testing tabulation, space optimization, and item selection reconstruction.

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Razorpay Mid-level (3–5 years) Coding / DSA

#4189

Design and implement an LRU cache with O(1) get and put — Razorpay interview

Reported in Razorpay interview loops. Hash map plus doubly linked list problem bridging DSA and system components.

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Razorpay Mid-level (3–5 years) Coding / DSA

#4190

How many distinct ways can you climb n stairs taking 1 or 2 steps at a time? — Razorpay interview

Reported in Razorpay interview loops. Introductory dynamic programming problem isomorphic to Fibonacci.

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PhonePe Mid-level (3–5 years) Coding / DSA

#4191

How do you perform topological sort on a directed acyclic graph? — PhonePe interview

Reported in PhonePe interview loops. Graph algorithm for task scheduling, build systems, and course prerequisites.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4192

What is dependency injection and why is it useful? — PhonePe interview

Reported in PhonePe interview loops. Java/Spring staple connecting OOP design to testable service architecture.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4193

How do you version a public API without breaking clients? — PhonePe interview

Reported in PhonePe interview loops. API evolution question covering compatibility, deprecation, and communication.

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PhonePe Mid-level (3–5 years) Behavioral

#4194

Tell me about a project that failed or missed its deadline. What did you learn? — PhonePe interview

Reported in PhonePe interview loops. Behavioral question testing accountability, retrospectives, and growth.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4195

Compare ACID and BASE consistency models in databases — PhonePe interview

Reported in PhonePe interview loops. Distributed data question bridging SQL transactions and NoSQL eventual consistency.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4196

How does Node.js handle concurrent requests with a single thread? — PhonePe interview

Reported in PhonePe interview loops. Node.js architecture question on libuv, event loop phases, and worker threads.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4197

When would you use useState versus useReducer in React? — PhonePe interview

Reported in PhonePe interview loops. React hooks question on local state complexity and predictable updates.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4198

What is the Python GIL and how does it affect concurrency? — PhonePe interview

Reported in PhonePe interview loops. Python-specific question on threading limits and multiprocessing alternatives.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4199

Explain the JavaScript event loop, call stack, and task queues — PhonePe interview

Reported in PhonePe interview loops. Core JavaScript concurrency model question for frontend and Node.js roles.

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PhonePe Mid-level (3–5 years) Technical deep dive

#4200

How does HashMap work internally in Java? — PhonePe interview

Reported in PhonePe interview loops. Java-specific collections question on buckets, hashing, and resize behavior.

Medium Read answer →